Mug tree



FIG. 1 is an oblique perspective view of the mug tree;

FIG. 2 is a right side view of the mug tree, as shown in FIG. 1;

FIG. 3 is a left side view of the mug tree;

FIG. 4 is a front side view of the mug tree;

FIG. 5 is a back side view of the mug tree;

FIG. 6 is a top view of the mug tree; and,

FIG. 7 is a bottom view of the mug tree. 

The ornamental design for a mug tree, as shown and described. 